The "sized right" Performance Brake
The Performance Brake Kit ("PBK") concept is simple; improvements in
design and construction combined with ideal rotor, caliper piston,
and pad tuning will result in better braking and even a
better-performing car. Whether it's a dedicated racecar or an
enthusiast-driven street car, these benefits pay great
BMW brakes are not all that bad. Many racers get by
quite satisfactorily with relatively small original brakes, so we
can conclude that size is not entirely the issue. Nevertheless, the
performance environment can stress the standard components in ways
that diminish their effectiveness. After trying basic upgrades in
pads and cooling, the next step is a "big brake kit". Done
properly, a traditional "BBK" works great and solves the problems.
However, the downsides include cost, wheel fitment, soft brake
pedal, and incomplete systems that can affect the brake bias which
will upset the handling of the car and even increase braking
Instead of a "BBK", the concept of a "PBK" is to
increase the Performance capabilities of the
components while also being easier to use and less-expensive to
||• direct-fit installation, simple bolt-on
replacement of OE brakes.
||• will not require spacers with most
||• some BMW wheels do not require spacers,
most aftermarket wheels do not require spacers..
||• keep original master
||• quick top-loading pad
||• improved (firmer) pedal feel and
||• better thermal performance (overheat
resistance) equivalent to or better than many BBKs.
||• excellent front/rear brake
||• weight savings of nearly 30lbs (varies
||• hundreds or thousands of dollars less
than typical BBK.
||• race pad costs substantially less than
standard BMW or typical BBK.
||• choice of slotted or perforated rotors.
||• choice of black or red calipers.
1 For many applications, only the front axle kit is
updated with the PBK brake torque calculated for ideal brake bias
with the original rear brakes. For other applications, there
are the options of the front-only PBK or a complete up-rated
The heart of the system is the
race-developed calipers from Wilwood, the product of nearly 30
years of racing in every venue imaginable from SCCA Improved
classes to the rigors of the NASCAR superspeedways. Depending on
the BMW application, either a 4-piston forged Superlite or
6-piston Superlite caliper is used. Every version used is
the latest premiere variant with piston sizes chosen to maintain
excellent front/rear brake bias with the rotor size selected, and
to maintain a firm pedal feel. The significant benefits
- stiffness exceeding the OEM
iron and other aftermarket cast aluminum calipers, resulting in
even pad wear and elimination of mushy brakes due to caliper
"squirm" caused by worn guide pins.
- easy pad changes due to top-loading caliper
- extremely light weight, approximately half
of the cast iron BMW caliper.
- affordable race pads available from every major
manufacturer, often 1/2 the cost of BMW-fitment pads.
- available in either black or
Rotors are a critical part of the brake system's energy
dissipation cycle. The UUC Stage2 and Stage3 kits use the rotor
fitment from the E46 M3. Benefits include:
- approximately 8%-15%* greater diameter for more
- up to 50%* greater thickness for larger interior
- affordable standard 1-piece design or genuine BMW
Motorsport "floating" rotors for with separate center hat to keep
heat out of the wheel bearing and to allow distortion-free heat
- choice of slotted or cross-drilled.
The "business end" of any brake setup is the
specific friction material used, which determines the final
characteristics of response curve, heat range, longevity, and a
variety of other characteristics including fine-tuning of brake
bias through different front/rear compounds. Every major pad
manufacturer offers their entire line of racing compounds and
several street compounds for the Wilwood Dynalite and Superlite
calipers, including but not limited to:
KFP Magnum (formerly Cool Carbon)
Brackets, hardware, and brake lines
Strong steel bracketry is a minor weight concession
that ensures durability and strength. All mounting hardware is the
appropriate metric or SAE size, and stainless steel brake lines are
The "sized right" brake kit
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